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Table 2 Adjusted prevalence of CB according to gender and age

From: Diverging trends of chronic bronchitis and smoking habits between 1998 and 2010

   Adjusted prevalence (%) [95% CI]  
   ISAYA (1998/2000) GEIRD (2007/2010) p-value
Gender* Males 12.3 [12.0−12.6] 12.6 [11.8−13.4] 0.575
  Females 12.6 [11.9−13.3] 12.7 [11.3−14.3] 0.920
Age <30 years 11.8 [11.2−12.5] 12.2 [10.9−13.6] 0.577
  ≥30 years 12.7 [12.2−13.2] 12.9 [12.0−13.8] 0.692
TOTAL   12.5 [12.1−12.9] 12.6 [11.7−13.7] 0.781
  1. * prevalence obtained by stratifying on gender and adjusted for age, season of response, type of contact, cumulative response rate, and centre.
  2. prevalence obtained by stratifying on age and adjusted for gender, season of response, type of contact, cumulative response rate, and centre.
  3. prevalence adjusted for gender, age, season of response, type of contact, cumulative response rate, and centre.
  4. p-value obtained by testing the null hypothesis that the regression coefficient of the dummy indicator of the study (GEIRD vs ISAYA) was zero.